With Chuck's Intersect powers now including a physical element, he has become more useful to the NSA/CIA and so the missions become more serious. Sadly, so does the series, with somewhat less of the humour from Seasons 1 and 2 that arose whenever Chuck was in over his head. However, a long-running sub-plot featuring Captain Awesome goes some way to redress that.
The good news is that the interrelationships of the characters are as strongly written as ever, with the actors inhabiting them so comfortably, it's hard to remember that this is only fiction.
Recurring guest star Brandon Routh is a significant addition to Team Bartowski as they go up against "The Ring", who have taken over from "Fulcrum" as the 'big bad'. Routh was the last actor to play Superman on the big screen, while another new guest star, Kristin Kreuk, was a show regular on pre-Superman TV show Smallville and now appears as a potential love interest for our hero.
Chuck's newly-returned father - played to eccentric perfection by genre favourite Scott Bakula - continues to play an important part where both Chuck's personal and professional lives intersect (see what I did there?). Another stand-out guest is Armand Assante, chewing the scenery for all it's worth as a flamboyant South American dictator.
Oh, and some more people find out the truth about Chuck. All in all, it's top stuff.